According to @VitalikButerin, a Plinko PIR tutorial is available via his X post on November 25, 2025, linking directly to the resource. Source: @VitalikButerin on X, November 25, 2025. Private Information Retrieval enables data queries without revealing which item is fetched, a core primitive for privacy-preserving dApps and DEX order flow on Ethereum. Source: Wikipedia entry on Private information retrieval. Order-flow privacy is tied to MEV and execution quality on Ethereum, making PIR-related work relevant to trader slippage and front-running risk. Source: Flashbots research on MEV and order flow privacy, MEV-Share documentation, 2023. Vitalik has previously highlighted privacy techniques such as stealth addresses on his blog, illustrating ongoing attention to privacy tooling in the Ethereum ecosystem. Source: Vitalik Buterin blog, An incomplete guide to stealth addresses, 2023.